🚀 go-pugleaf

In <4vj6cq$aql@grivel.une.edu.au> dbromage@metz.une.edu.au (David Bromage) writes:

>moneyworld.com is now being served through psi.net, who are known to
>ignore spam complaints.

Oh no ... just when I thought they were being permanently kicked off the Net
once their MCI contract ran out.

>All sites should be set to refuse SMTP connections from both domains.

I don't think it'll work. Let's assume I filter packets from their
network at my main router. Their SMTP connections fail, so they look at
the DNS and go to the next best MX record for my domain. Now I have to
ask my forwarding hosts to block packets at their own routers. (which they
might or might not do).

Next step is moneyworld.com simply sends mail to my domain via an SMTP
server on some 3rd party network, which will accept mail for what (to
them) is a 3rd party (i.e. me). I don't know who those sites are and I
can't block their packets since I might also cut off legitimate E-mail.

I think there are only 2 effective defences:

1.  Have the local SMTP server reject messages based on the From: domain
(or the contents of the message headers) (which is different from
refusing SMTP connections one is at a packet level and the other is at
the SMTP protocol level).

2. Have the mailer accept E-mail from that domain and silently bitbucket it.

The former has the advantage of alerting slick Willie that we don't like
him (unless he's protected himself from incoming Net data really well);
the latter provides no feedback.

Nick.
-- 
Kralizec Dialup Internet System         Data: +61-2-9837-1183, 9837-1868
Zeta Microcomputer Software             Fax: +61-2-9837-3753 Voice: 9837-1397
P.O. Box 177, Riverstone NSW 2765       http://www.kralizec.net.au/